US5015134A - Tapping screw - Google Patents

Tapping screw Download PDF

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Publication number
US5015134A
US5015134A US07/486,654 US48665490A US5015134A US 5015134 A US5015134 A US 5015134A US 48665490 A US48665490 A US 48665490A US 5015134 A US5015134 A US 5015134A
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US
United States
Prior art keywords
shank
drill edge
maximum diameter
tapping screw
threads
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/486,654
Other languages
English (en)
Inventor
Isamu Gotoh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yamaki Sangyo Co Ltd
Original Assignee
Yamaki Sangyo Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yamaki Sangyo Co Ltd filed Critical Yamaki Sangyo Co Ltd
Assigned to YAMAKI SANGYO CO., LTD. reassignment YAMAKI SANGYO CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: GOTOH, ISAMU
Application granted granted Critical
Publication of US5015134A publication Critical patent/US5015134A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
    • F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
    • F16B35/06—Specially-shaped heads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/001—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
    • F16B25/0015—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the material being a soft organic material, e.g. wood or plastic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
    • F16B25/0047—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the ridge being characterised by its cross-section in the plane of the shaft axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
    • F16B25/0057—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the screw having distinct axial zones, e.g. multiple axial thread sections with different pitch or thread cross-sections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
    • F16B25/0068—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw with multiple-threads, e.g. a double thread screws
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/10—Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing screws
    • F16B25/106—Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing screws by means of a self-piercing screw-point, i.e. without removing material

Definitions

  • the invention relates to a tapping screw adapted to be screwed into a mounting surface of wood or the like while forming threads therein and more specifically a tapping screw having a structure for preventing cracks from being formed on the mounting surface when the screw is driven in.
  • FIG. 6 shows a prior art tapping screw which comprises a shank 11 having a tapered tip 12 and a head 13 formed integrally with the rear end of the shank and having a larger diameter than that of the shank 11. The latter is formed on its entire peripheral surface with threads 14.
  • the head 13 of this tapping screw has such a shape as to expand from the shank 11 to form a conical shape.
  • the screw is usually screwed into a mounting surface until its head 13 sinks below the surface.
  • tapping screw having such a structure has a drawback that because the threads 14 on the shank 11 have the same diameter and the same lead angle, when the shank is screwed in up to its rear end, a considerable amount of heat tends to be produced as the contact length of threads increases. This may cause the seizure of threads.
  • the mounting member A when the screw is driven in until its head 13 sinks below the mounting surface, the mounting member A will be forcibly expanded radially by the head 13 as shown in FIG. 7. This may result in the development of cracks in the mounting member. Cracks are more likely to develop if the mounting member is a hard wood.
  • One prior art tapping screw has its head tapered moderately into a conical shape in order to reduce changes in the stress which acts on the mounting member. But the eventual deformation resulting from the penetration of the head is the same as with other prior art screws. Thus if the mounting member is a hard wood, such a shape is of no advantage and cracks will develop as with other prior art screws.
  • a tapping screw having a shank having a main portion, a tapered portion at its tip and a head having a larger diameter than that of the shank, the shank being formed on the outer peripheral surface thereof with threads.
  • the invention is characterized in that the shank is formed on the tapered portion with a drill edge having a maximum diameter smaller than the maximum diameter of the threads formed in the rear thereof.
  • the head has its portion at the side of the shank shaped into a pyramid so as to expand rearwardly from the shank.
  • the drill edge chips off the threaded hole tapped by the tapered portion.
  • the threads on the main portion of the shank bite into the thus formed starting hole.
  • the mounting member A When the screw is driven in up to its head, the mounting member A is initially expanded so as to comply with the sectional shape of the pyramid (square pyramid in the example shown). But thereafter it shrinks in such a manner as to fill gaps defined between the planes and the corners forming the pyramid. Thus the mounting member A deforms at its contact area with the corners of the pyramid, thus allowing the strain to be released toward the planes at both sides. This will considerably relax the concentration of stress and thus prevent cracks.
  • a rear drill edge may be provided besides the drill edge on the tapered portion in order to drill the threaded hole again. This will not only make subsequent screwing smoother but also facilitate pushing in the head.
  • FIG. 2 is a sectional view taken along line II--II of FIG. 1;
  • FIGS. 3 and 4 are enlarged views of portions of the tapping screw shown in FIG. 1;
  • FIG. 6 is a front view; of a prior art tapping screw
  • FIG. 7 is a sectional view taken along line VII--VII of FIG. 6.
  • Threads 5' are formed on the peripheral surface of the tapered portion 2 of the shank 1, whereas threads 5 having the same lead angle as the threads 5' are formed on the peripheral surface of the shank 1 to extend from the tapered portion 2 to the head 3.
  • Drill edges 6 and 7 are formed on the peripheral surface of the shank at the tapered portion 2 and at an intermediate portion between the tapered portion 2 and the head 3, respectively, so as to be independent of the threads 5 and 5'.
  • the maximum diameter d1 of the drill edge 6 is larger than the maximum diameter d3 of the threads 5' on the tapered portion 2 and smaller than the maximum diameter d4 of the threads 5 on the main portion of the shank (d3 ⁇ d1 ⁇ d4).
  • the drill edge 7 has a maximum diameter d2 equal to or larger than the maximum diameter of the threads 5 on the main portion of the shank (d2 ⁇ d4).
  • the upper limit by which the maximum diameter d2 of the drill edges 7 exceeds the maximum diameter d4 of the threads 5 should be set at about 0.15 mm.
  • the head 3 has a neck portion it connecting to the shank 1 and having a square pyramidical shape expanding from the shank 1 rearwardly.
  • the section of the square pyramidical portion in a direction perpendicular to the axis of the screw has such a shape that the respective opposite planes 9 of the square pyramidical portion are parallel to each other and the corners 10 formed by the adjacent planes 9 are rounded off.
  • the head 3 has a circular section at a portion near its rear end face 3a formed with a driver groove 4.
  • the mounting member A when the head 3 is thrust in while turning, the mounting member A is expanded by the corners 10 of the square pyramid. But thereafter it will shrink by the resilience of wood or the like so as to fill the spaces a between the corners 10 and the planes 9. Then the mounting member A will be expanded by the next corner 10 as the screw turns and it will shrink again. It is thus gradually expanded as the shrinkage and expansion are repeated.
  • the head 3 When the head 3 is inserted completely, only the portions in contact with the corners 10 of the square pyramid are subjected to deformation and strain. But the other part will expand back to their previous state after the deformation and there is substantially no strain. Thus the strain in the regions near the corners is released to both sides and the overall strain is reduced. This will reduce the stress in the mounting member A and thus prevent cracks.
  • the head 3 has a square pyramidical shape but it may be in the shape of a triangular pyramid or a pentagonal pyramid.
  • the threads to the rear of the drill edges 7 may be of a greater diameter than the drill edges 7 and the threads in front thereof so that the threads can bite into the mounting member securely over the whole length of the screw.
  • the tapping screw shown in FIG. 1 may be used to fix a composite material such as a ceramic siding panel to wood.
  • this tapping screw may be used to secure a ceramic siding panel as a wall body to a wood wall surface.
  • the drill edges 6 and 7 will drill the wall body of siding panel, thus expanding the threaded hole. This allows the head to penetrate easily.
  • the shock to the wall body when the screw is driven in up to its head is reduced. This will effectively prevent cracks on the wall body.
  • the threads 5 and 5' in front of the drill edges 7 are screwed into the wood, thus allowing the tapping screw to firmly bite into the mounting surface without the fear of being pulled out.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Wood Science & Technology (AREA)
  • Connection Of Plates (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
US07/486,654 1989-09-12 1990-03-01 Tapping screw Expired - Fee Related US5015134A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1-107117[U] 1989-09-12
JP1989107117U JPH0716090Y2 (ja) 1989-09-12 1989-09-12 タッピングねじ

Publications (1)

Publication Number Publication Date
US5015134A true US5015134A (en) 1991-05-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
US07/486,654 Expired - Fee Related US5015134A (en) 1989-09-12 1990-03-01 Tapping screw

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US (1) US5015134A (lm)
JP (1) JPH0716090Y2 (lm)

Cited By (63)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5295774A (en) * 1990-01-16 1994-03-22 W. A. Deutsher Pty. Ltd. Screw and method of making same
US5413444A (en) * 1994-01-06 1995-05-09 Illinois Tool Works Inc. Self-drilling fastener
US5827030A (en) * 1995-09-06 1998-10-27 A-Z Ausrustung Und Zubehor Gmbh & Co., Kg Thread forming joining elements
US5827031A (en) * 1997-05-14 1998-10-27 Swallow; Gregory T. Self starting finishing screw and driver tool
EP0939235A1 (de) * 1998-02-25 1999-09-01 Ludwig Hettich & Co. Schraube
GB2356028A (en) * 1999-11-05 2001-05-09 John Jay Threaded fasteners
US6302631B1 (en) * 1999-09-21 2001-10-16 Seiichiro Takasaki Wood screw having a head with side ridges
US20030021653A1 (en) * 2001-07-27 2003-01-30 Seiichiro Takasaki Wood screw
US6672812B1 (en) * 2002-06-17 2004-01-06 Chao-Wei Lin Wood screw with different shank radii
US20040228705A1 (en) * 2003-05-16 2004-11-18 Abbott-Interfast Corporation. Fasteners for composite material
US20050069396A1 (en) * 2003-09-30 2005-03-31 Wu Keng Shui Screw
US20050155311A1 (en) * 2004-01-20 2005-07-21 Richard Belinda Wood truss fastener
US20050163596A1 (en) * 2004-01-22 2005-07-28 Jen-Tong Ho Screw with a plurality of screwing angles and mold device for forming the same
US20050171562A1 (en) * 2002-06-11 2005-08-04 Criscuolo Christopher J. Hernia mesh tacks
US20060140738A1 (en) * 2004-12-27 2006-06-29 Teng-Hung Lin Screw
US20060195099A1 (en) * 2005-02-15 2006-08-31 Apex Abc, Llc Bone screw for positive locking but flexible engagement to a bone
US20070065255A1 (en) * 2005-09-21 2007-03-22 A-Stainless International Co., Ltd. Thread section for screws
US20070237606A1 (en) * 2006-04-11 2007-10-11 Seiichirou Takasaki Screw for composite building materials
US20080118332A1 (en) * 2006-11-16 2008-05-22 David Lamb Drywall screw
US7402016B2 (en) * 2005-12-02 2008-07-22 Simpson Strong-Tie Company, Inc. Variably threaded screw
US20080188899A1 (en) * 2007-02-07 2008-08-07 Apex Biomedical Company, Llc Rotationally asymmetric bone screw
US20090311074A1 (en) * 2006-07-26 2009-12-17 Heinrich Friederich Hole-forming and thread-forming screw
US7677854B2 (en) * 2006-01-12 2010-03-16 Spax International Gmbh & Co. Kg Self-boring and self-tapping screw
DE102008048703A1 (de) * 2008-09-24 2010-03-25 Fischerwerke Gmbh & Co. Kg Schraube
US20100143070A1 (en) * 2007-02-05 2010-06-10 Ulrich Hettich Head of a countersunk screw
EP2317159A1 (de) * 2009-10-28 2011-05-04 SPAX International GmbH & Co. KG Schraube insbesondere für zementgebundene Faserplatten
US20110170984A1 (en) * 2010-01-13 2011-07-14 National Nail Corp. Fastener, installation tool and related method of use
US20110229286A1 (en) * 2010-03-18 2011-09-22 Essence Method Refine Co., Ltd. Versatile fastener
CN102235410A (zh) * 2010-04-26 2011-11-09 宽仕工业股份有限公司 木螺丝
US20130011214A1 (en) * 2011-07-07 2013-01-10 Teng-Hung Lin Drilling scrwe with compound threads
USD704018S1 (en) 2012-01-04 2014-05-06 National Nail Corp. Fastener installation tool
US8740955B2 (en) 2005-02-15 2014-06-03 Zimmer, Inc. Bone screw with multiple thread profiles for far cortical locking and flexible engagement to a bone
US8955210B2 (en) 2010-01-13 2015-02-17 National Nail Corp. Fastener, installation tool and related method of use
US20150063946A1 (en) * 2012-05-10 2015-03-05 Simpson Strong-Tie Company, Inc. Fastener with head cutting structure
US9120214B2 (en) 2010-01-13 2015-09-01 National Nail Corp. Fastener, installation tool and related method of use
US9144896B2 (en) 2010-01-13 2015-09-29 National Nail Corp. Fastener, installation tool and related method of use
US9322422B2 (en) 2012-07-23 2016-04-26 Simpson Strong-Tie Company, Inc. Fastener with drill pilot and reversed threaded regions
US9523383B2 (en) 2013-03-26 2016-12-20 Simpson Strong-Tie Company, Inc. Variable thread fastener
US9651079B2 (en) 2013-03-21 2017-05-16 Simpson Strong-Tie Company, Inc. Fastener with prolate cross-section
US20170152881A1 (en) * 2015-11-27 2017-06-01 Hui-Ju Yang Screw
DE102016203864A1 (de) * 2016-03-09 2017-09-14 Schmid Schrauben Hainfeld Gmbh Schraube
US9802300B2 (en) 2010-01-13 2017-10-31 National Nail Corp. Fastener, installation tool and related method of use
US20180100533A1 (en) * 2016-10-07 2018-04-12 Illinois Tool Works Inc. Winged threaded fastener
EP3366933A1 (en) * 2017-10-12 2018-08-29 Taiwan Shan Yin International Co., Ltd. Screw
US20180298934A1 (en) * 2017-04-18 2018-10-18 Adolf Würth GmbH & Co. KG Wood Screw Having an Arc-Shaped Protrusion Between Thread Turns
AU2015368405B2 (en) * 2014-12-24 2019-01-31 Fujitomi Corporation Drivable screw nail
USD842086S1 (en) * 2018-02-26 2019-03-05 National Nail Corp. Screw
US20190113066A1 (en) * 2017-10-16 2019-04-18 Yao Cheng Co., Ltd. Wood screw
USD924044S1 (en) 2019-11-20 2021-07-06 National Nail Corp. Fastener positioning device
US20210277927A1 (en) * 2020-03-05 2021-09-09 Vertex Precision Industrial Corp. Screw
US11149445B2 (en) 2017-08-15 2021-10-19 National Nail Corp. Hidden fastener unit and related method of use
US11174887B2 (en) * 2016-11-21 2021-11-16 Swg Schraubenwerk Gaisbach Gmbh Wood screw and method for producing a wood screw
US11181138B2 (en) 2013-03-26 2021-11-23 Simpson Strong-Tie Company, Inc. Variable thread knurl fastener
USD945870S1 (en) 2020-11-17 2022-03-15 National Nail Corp. Fastener positioning device
US11396898B2 (en) * 2020-01-17 2022-07-26 Kuo-Tai Hsu Screw with hole-enlarging portion
US11603670B2 (en) 2017-08-15 2023-03-14 National Nail Corp. Hidden fastener unit and related method of use
US11731252B2 (en) 2021-01-29 2023-08-22 National Nail Corp. Screw guide and related method of use
US11840848B2 (en) 2017-08-15 2023-12-12 National Nail Corp. Hidden fastener unit and related method of use
US11898357B2 (en) 2017-08-15 2024-02-13 National Nail Corp. Hidden fastener unit and related method of use
US11920618B2 (en) 2017-08-15 2024-03-05 National Nail Corp. Hidden fastener unit and related method of use
US11938596B1 (en) 2023-01-26 2024-03-26 National Nail Corp. Fastener installation tool and related method of use
USD1019365S1 (en) 2023-05-31 2024-03-26 National Nail Corp. Fastener positioning device
USD1022684S1 (en) 2023-02-23 2024-04-16 National Nail Corp. Fastener positioning device

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JP4531510B2 (ja) * 2004-09-28 2010-08-25 誠一朗 高崎 木ねじ

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US2403359A (en) * 1943-11-05 1946-07-02 Gerhold Alfred Screw
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US373074A (en) * 1887-11-15 Wood-screw
US1396455A (en) * 1919-10-29 1921-11-08 George A Moore Capstan-screw
US2403359A (en) * 1943-11-05 1946-07-02 Gerhold Alfred Screw
US3524378A (en) * 1968-12-05 1970-08-18 Illinois Tool Works Stitching screw
US4653244A (en) * 1986-01-16 1987-03-31 Farrell Mark A Fastener element
US4874278A (en) * 1987-02-16 1989-10-17 Kabushiki Kaisha Yamahiro Wood screw with chip removing portion
US4834602A (en) * 1987-06-19 1989-05-30 Yao Seibyo Co., Ltd. Tapping screw

Cited By (109)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5295774A (en) * 1990-01-16 1994-03-22 W. A. Deutsher Pty. Ltd. Screw and method of making same
US5413444A (en) * 1994-01-06 1995-05-09 Illinois Tool Works Inc. Self-drilling fastener
US5827030A (en) * 1995-09-06 1998-10-27 A-Z Ausrustung Und Zubehor Gmbh & Co., Kg Thread forming joining elements
US5827031A (en) * 1997-05-14 1998-10-27 Swallow; Gregory T. Self starting finishing screw and driver tool
EP0939235A1 (de) * 1998-02-25 1999-09-01 Ludwig Hettich & Co. Schraube
DE19807926A1 (de) * 1998-02-25 1999-09-09 Hettich Ludwig & Co Schraube
US6302631B1 (en) * 1999-09-21 2001-10-16 Seiichiro Takasaki Wood screw having a head with side ridges
GB2356028A (en) * 1999-11-05 2001-05-09 John Jay Threaded fasteners
US6739815B2 (en) * 2001-07-27 2004-05-25 Yao Seibyo Co., Ltd. Wood screw
US20030021653A1 (en) * 2001-07-27 2003-01-30 Seiichiro Takasaki Wood screw
US8343176B2 (en) 2002-06-11 2013-01-01 Covidien Lp Hernia mesh tacks
US20150018847A1 (en) * 2002-06-11 2015-01-15 Covidien Lp Hernia mesh tacks
US7867252B2 (en) * 2002-06-11 2011-01-11 Tyco Healthcare Group Lp Hernia mesh tacks
US20110071538A1 (en) * 2002-06-11 2011-03-24 Tyco Healthcare Group Lp Hernia mesh tacks
US10258450B2 (en) 2002-06-11 2019-04-16 Covidien Lp Hernia mesh tacks
US20050171562A1 (en) * 2002-06-11 2005-08-04 Criscuolo Christopher J. Hernia mesh tacks
US9486218B2 (en) * 2002-06-11 2016-11-08 Covidien Lp Hernia mesh tacks
US20100256658A1 (en) * 2002-06-11 2010-10-07 Tyco Healthcare Group Lp Hernia mesh tacks
US8382778B2 (en) 2002-06-11 2013-02-26 Covidien Lp Hernia mesh tacks
US8852215B2 (en) 2002-06-11 2014-10-07 Covidien Lp Hernia mesh tacks
US8821522B2 (en) 2002-06-11 2014-09-02 Covidien Lp Hernia mesh tacks
US6672812B1 (en) * 2002-06-17 2004-01-06 Chao-Wei Lin Wood screw with different shank radii
US8430618B2 (en) 2003-05-16 2013-04-30 Abbott-Interfast Corporation Fasteners for composite material
US20040228705A1 (en) * 2003-05-16 2004-11-18 Abbott-Interfast Corporation. Fasteners for composite material
US20050069396A1 (en) * 2003-09-30 2005-03-31 Wu Keng Shui Screw
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